Computer Science – Performance
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa43a1740t&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA43A-1740
Computer Science
Performance
[3332] Atmospheric Processes / Mesospheric Dynamics, [3369] Atmospheric Processes / Thermospheric Dynamics
Scientific paper
The Earth’s middle and upper atmosphere is a complex and important region, here the neutral particles are interacting with charged particles, and the region is coupled with the lower atmosphere as well as the magnetosphere. In order to advance our knowledge on the coupling between the neutral atmosphere and the ionosphere greatly, it is essential to measure relevant neutral and ionospheric physical parameters simultaneously. To make these kinds of simultaneous measurements, we plan to install a new sodium lidar for temperature observations near the European Incoherent Scatter (EISCAT) radar site at Tromsø, Norway (69.6°N, 19.2°E). In this presentation, we report first test observations of our sodium lidar at Wako, Japan (35.8°N, 139.6°E) in November and December 2009 as well as current status of the sodium lidar project. An all-solid-state Q-switched single-frequency source tuned to the sodium D2-a line at 589.1583 nm is developed for the lidar laser. The source is based on sum-frequency mixing two injection-locked Nd:YAG lasers in LiB3O5, which is used under 90° phase-matching condition at a temperature of 39.5°C. Performance of the laser is currently an average output power of ~2 W at a repetition rate of 1 kHz. The laser frequency is calibrated using the Doppler-free saturation fluorescence spectra of sodium atoms. The lidar receiver is mainly consisted of a 355-mm diameter Schmidt-Cassegrain telescope and a high-speed photomultiplier tube of quantum efficiency of ~40%. Pulses from the photomultiplier is amplified and detected by a high-speed multi-channel scaler. The lidar system has now been nearly completed. Using the developing lidar, we conducted first observations of the lidar at Wako during 16-20 November and 14-18 December 2009, in order to test our new lidar system before we start temperature observations at Tromsø. The lidar system worked properly. We succeeded detections of backscatter signals from the sodium layers at 85-110 km height. We found that precision of obtained temperature data is less than 5 K in a case of 20-min time integration and 4-km height integration. The lidar will be ready for operation at Tromsø in October 2010, and hopefully its first report will be also included in this presentation.
Brekke Asgeir
Fujii Ryoichi
Hall Chris Michael
Kawabata Takuya
Kawahara Takayuki
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